As long as you keep inside the NUMA limits you should be OK.For example:
1 core , 2 threads is equal to 2 cores, 1 thread each
After all, all VMs in KVM are just processes.
Yet, if your server has 2 CPUs each with 6 cores ( 2 threads per core ) ,you should avoid setting VMs with 13 vCPUs (13 real threads) as you will have to use some of the threads on the second CPU.
i think there is a guide for High Performance VMs where NUMA cases are described quite well.
Best Regards,
Strahil Nikolov
On Mon, Mar 7, 2022 at 16:37, Laurent Duparchy
<duparchy@esrf.fr> wrote:
Thanks for your reply.
So, no performance issue if the virtual topology does not match the
physical one ?
Laurent Duparchy
ESRF - The European Synchrotron
MIS Group
04 76 88 22 56
Strahil Nikolov wrote on 07/03/2022
15:10:
I think
it's most useful for licensing purposes -> like the Win10
example
Best Regards,
Strahil Nikolov
Hi,
Given the fact that there is the option to
match de CPUs physical topology (Socket / Core / Threads)
, I guess it can make a difference.
When ?
Linux vs Windows ?
(One example I know is that Windows 10 won't
access more than 4 sockets.)
_______________________________________________